pinctrl: fsl: add scu based pinctrl support

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Some i.MX SoCs (e.g. MX8QXP and MX8QM) contain a system controller
that is responsible for controlling the pad setting of the IPs that
are present. Communication between the host processor running an OS
and the system controller happens through a SCU protocol.

This patch classifies the pad settings into two categories: MMIO and SCU.
For the original MMIO method, no functional changes except organize them
into a few imx_*_mmio() functions. Besides that, we add the SCU based
Pad Mux and Pinconf setting support which are implemented in pinctrl-scu.c.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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This commit is contained in:

A.s. Dong 2018-10-30 14:10:51 +00:00 • committed by Linus Walleij

parent 1ccb0426d7

commit b96eea718b

5 changed files with 448 additions and 170 deletions

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4

drivers/pinctrl/freescale/Kconfig

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1

drivers/pinctrl/freescale/Makefile

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427

drivers/pinctrl/freescale/pinctrl-imx.c

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67

drivers/pinctrl/freescale/pinctrl-imx.h

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121

drivers/pinctrl/freescale/pinctrl-scu.c

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